Darwin's metal detecting fraternity and friends are abuzz with the news that an intrepid searcher- eager to find the Australian equivalent of a Saxon treasure trove - has found $750 worth of coins in one location . Meanwhile , on Magnetic Island , without the aid of a metal detector , a resident related to Darwin detectorists found a 10 cent coin on the ground while waiting in a queue to be tested for Covid -19 , hereinafter to be called Treasure Island or Oak Island .